Process of preserving wood.



rnocnss on rnnsniwme woob.

1,016,024. specifica n n Patented Jan. 30,1912. No Drawing. Application filed DecemberlO, 1910. Serial No. %,712 .To all it may concern. I. then force this solution into the 'timber Be it known that I, ERNST MARMETSGHKE, -under pressure. When suflicient of the subject of the Emperor of Germany, represervative solution has been injected I siding at Schiip rth, near ,Eherswalde, release the pressure and raise the tempera- Prussia, Germany, have invented certain ture of the timberfstill immersed in the new-and useful Improvements in Processes, solution, to about, 70 centigrade and'keep of Preserving ;Wood, of whi ch the fi llowit at this temperature, or about an hour.

--ing 1s. a specification. This temperature and time are sufii'cient to In Letters Patent of the United States secure coagulation of theoolloidal-constitu- #8 98,24:6, granted September 8, 1908, I cuts and permanent incasing of the preserhave described a process in which thewood vat-ive in the cells of thewood, so that it to be treated is subjected to the action of a cannot be washed out. preservative ,solution composed of 'zinc If the solution is injected below the co,- chlorid and aluminium sulfate, at an efl'ecagulating point of the colloidal constituents tive'lowjtemperature of-60 0. the highest and the timber not subsequently heated temperature not to exceed 98 C, About above 60 centigrade the salts are easily. 60 Q or between 60 C. and 65 vC. coagulixivlated and if the whole process is carlation of the colloidal constituents takes ried out above 60 cent'igrade the-colloidal place, audit the temperature does not reach constituents coagulate before the injection 60 it is ineffective to establish permanent is complete so that the. tamount which can impregnation and hence the minimum tembe injected is limited and the salts cannot perature stated in my former patent. 7 be incased or combinedby further heating.

I have now discovered that the process The invention is not to be confined to the of my formerpatent can be carried out exact temperaturesabove stated as theessenwith greater'efiectivenes's by first subjecting tial feature consists in theinjection of the the wood to be treated to the action of preservative solution at atemperature bethe preservative solution at a temperature low'that at which the colloidal constituents below that where thefixing of'the salts coagulate, while the material is subsetake place, so as to allow the wood to bequently heated above this point, Similarly come thoroughly saturated and absorb the any equivalents of thesaltsspecified may greatest quantity of the preservative mateemployed. t rial. Thereafter the wood in the imme- What I claimiszdi'ate presence of the injected salts is heated 1. A process of preserving wood and to a temperature suflicient to coagulate the other fibrous materials which consists in colloidal constitutents This has the effect first injecting a;- pFese rvative, solution into of closing the-wood a cells and permanently the material at a temperature below that at incasing the preservatice therein. "which the colloidal substances contained To ,carry out the process I use a stor therein coagulate and subsequently raising tank for storing and heating the solution, the temperature of the wood' above this a pressure cylinder with fittings, vacuum, temperature fo'rthe purpose set forth.

and pressure pumps as in the known proc- 2.- A process of preserving wood and esses for impregnating timber, with conother fibrous materials which consists in nections for blowing live steam into the forcing a solution of zinc chlorid and alucylinder. I make up the solution preferminium sulfate at a temperature of about ably with a 3% solution of zinc chlorid and f 55 G, into the material and subsequently,

a 1.5% solution of aluminium sulfate and raising the temperature of the material to,

after subjecting the timber in the pressure about 70 C. substantially as and for the cylinder to 'a vacuum, draw in the solution purpose hereinbefore set forth.

at a temperature of about 55 centigrade. 3. A process ofpreserving wood and the 2 mmqm like donsistihg in' subjectingth wood. or raising the temper atgre above thg coagu-x other material to a vacq'um, in a closed. ves lating point, substant'mlly as de scmbed. 5'10 ''el, introducing into Sald. vessel an impreg-- In. testimony whereof, a my slanating solutiop consisting of zinc chlond tune in presence of two WItIIGSSGS'."

5 and "aluminium sulfate at a temppmture ERNST MARMETSC if? belww the point ofooagulation; mismg the Witnesses? pressure to saturate the; wood or other ma; K'UNO Sc, terialamd finally releasmg the pqrssuremld Cum: MfiLLER. 

